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New Relic's Open-Source Elixir Agent
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lib/new_relic/aggregate/aggregate.ex
defmodule NewRelic.Aggregate do
defstruct meta: %{}, values: %{}
# A metric-like struct for reporting aggregate data as events to NRDB
@moduledoc false
def merge(aggregate, values) do
new_values = Map.merge(aggregate.values, values, fn _k, v1, v2 -> v1 + v2 end)
%{aggregate | values: new_values}
end
def annotate(aggregate) do
aggregate.values
|> Map.merge(averages(aggregate.values))
|> Map.merge(aggregate.meta)
|> Map.put(:category, :Metric)
end
def averages(%{call_count: call_count} = values) do
values
|> Stream.reject(fn {key, _value} -> key == :call_count end)
|> Enum.reduce(%{}, fn {key, value}, acc ->
Map.put(acc, :"avg_#{key}", value / call_count)
end)
end
def averages(_values), do: %{}
end